I guess we'll disagree on that one, F'D' - I've found pax to be interested and reassured both by the ability of the aeroplane to glide well with idle power and the fact that we can position to land in a field without problems. It only takes the most basic commentary for them to figure out what we're doing.
As for
Most bad aviation incidents will have a preamble along the lines of: 'Look at how well I can do this etc'
that's a bit melodramatic, don't you think? We're not talking about some ham-fisted wingover here, or the infamous low-level steep turn. We're talking about demonstrating a PFL to a passenger, going around once we're established - and, quite frankly, if you
cannot do that safely then you probably shouldn't have licence nor passenger.